Lee

Basically your level is ONLY by how much SP you have accumulated (in the tutorials by Mari), your HP is now level*5 instead of what it was before, and damage mitigation, health recovery, and so forth have all been given a considerable boost. Oh, and you start SP is 5 instead of 2, so you have 3 more than before.

To describe swords arts simply, there are four kinds. One that strike multiple times, ones that hit harder, ones that hit more than one enemy at a time, and ones that stun people. Energy is spent, and your energy is the same as your level, each time you use a sword art, and you regen at 1 turn in combat and all of it after 3 rounds out of combat. Also missing a sword art costs 2 energy.

Anything else? :D 

Okay, I think, THINK that I may have everything right in my head. 
I thank you kindly for the summery and breakdown and if I do happen to have more questions, I shall Private Message you if it would be alright.

If you have more PM me, I should be able to answer it :)